Research And Implementation For Spatial Metadata Interoperation Based On OAI-PMH

In the past twenty years, GIS has been applied in many fields, such as resource management, environment fathering, disaster prevention, city management and so on. But traditional GIS systems are thought as "Information Islands". When different GIS departments exploit systems, they use different data modeling ways and GIS software based on their own special intentions, which made data exchanging very difficult among different GIS systems. Even through data changing, the problem can also be solved partly. On the other hand, different application departments have different comprehension and different data definition about geographic objects, which brought great barricade when information sharing and exchanging. Third, with the development of Digital Earth, the geo-information become more and more rich and the quantity of data become more and more huge. I low to manage and use these marvelous data? How to fulfill spatial information exchange among different departments and application systems? How to realize the value of these data? It is the emergence of spatial metadata made it simple for GIS data sharing and interoperation.There is much comparability between the metadata of Digital Library and GIS, such as scale, kinds, distribution, visitor and so on, of course, the latter is more complicate and marvelous than the former. In order to adapt the rapid development of WWW and the emergence of Digital Library, librarians and information specialists work hard to describe, organize and search long-distance and other electric resource. During the period, a large scale of metadata system develops. Since more and more metadata standards come out, when we search, describe and utilize resource, there is a new challenge梩he problem of metadata interoperation. Fortunately, with the development of metadata standards, many metadata interoperation protocols emerged sequentially. Consequently, the research of metadata interoperation is more successful in the field of Digital Library than that of GIS.Whereas the much comparability between the two fields, this dissertation wants to borrow some protocol from Digital Library fields. Open archive initiative protocol of metadata harvesting (OAI-PMH) shows the great superiority and the wide developing foreground on the application and interoperation in Digital Library field. The dissertation brings forward the new idea of applying OAI-PMH in spatial metadata interoperation.The dissertation brings forward a technical frame of spatial metadata interoperation based on OAI-PMH, and extends the content and function of OAI protocol.